It looks like at least CJB's Modpack on the Cheat and Quickcraft components throws errors when using ForgeModLoader.  I did try updating PlayerAPI (which CJB is reliant on) and updating to the newest test build on CJB with no change.  I've attached the ForgeModLoader-client-0.log file for you so you can look into it.

 

ForgeModLoader-client-0.log

reading your log leads me to beleive that whatever zip you have that contains 'CJB_PlayerController.class' is corrupt and has a corrupt class file. Try redownloading everything fresh.

This is an older post but we figured it out.  It is a combination of how FML is setup to load the external mods and how the author of CJB packaged it.  It is throwing the error because it is loading the CJB_CHEATS package before CJB_MAIN and since CJB_PlayerController isn't contained in CJB_CHEATS it throws the exception.  It won't get that file until CJB_MAIN is loaded.  FML appears to load things in alphabetical order.  The workaround for now is to simply rename the CJB_MAIN file to something that makes it higher in the alphabetical order.  I just stripped off the _MAIN part and that was enough.  Is there anything we can do on this end to make it so that won't be necessary in the future?

IIRC cpw has fixed cjb issues in recent versions.

The problem existed on the most recent recommended so unless the patch was applied after that point...

 

EDIT: Checked on build 260 and load order is still alphabetical and still breaks CJB due to this without a package rename.

There's actually a getModPriorities that was back in 1.2.5, does it still work in FML 3 and Forge 4?

Thanks for that tip.  I did some hunting on that and found a bug report post related to FML that suggested a function call that FML uses to prioritize mods.  I'll suggest it to the mod author in their thread.

 

https://github.com/cpw/FML/issues/48